It is an annual day of mourning but tensions have been heightened because of loud calls online for a third intifada, the shooting death of a Palestinian teen in East Jerusalem on Friday allegedly by settlers or their security, general upheaval in the region and the recent unity deal between Fatah and Hamas.

At dawn prayers in Gaza, Hamas Prime Minister Ismail Haniyeah said Nakba is marked "with great hope of bringing to an end the Zionist project in Palestine."

Sunday saw clashes in Issawiya, Hebron, and outside Ramallah, with demonstrations also taking place in Gaza and the West Bank.

One person was killed and at least 15 others were injured when a truck plowed and pedestrians in Tel Aviv. The driver of the truck, who has denied that it was an intentional act, was later arrested by police.

Near the Kalandia checkpoint in the West Bank, there were scenes of tires burning and Palestinians throwing rocks at Israeli soldiers. The atmosphere was completed by the smell smoke and tear gas in the air and the sounds of hundreds of protesters and sirens from ambulances driving through the crowd.

Several people were reportedly killed after Israeli forces opened fire on protestors at border crossing points in Gaza, the West Bank, Golan Heights and the frontier with Lebanon, the BBC reports.